AVG has launched free security software for Mac OS X, which includes tools for Safari and Firefox. AVG's CEO JR Smith, says, "Mac users have traditionally been less vulnerable to attacks because of their lower market share, but that is quickly changing." That's the age-old question of to what extent the scourge of malware on Windows is a symptom of Microsoft's sloppy security decisions vs. due to Windows' popularity and the fact that malware authors can get "more bang for their buck" targeting the most popular platform.